Below is the mass spectrum of an unknown hydrocarbon. In addition, this hydrocarbon shows characteristic absorption at 2100 cm - 1 in its IR spectrum. Give the structure of this unknown. 
(Spectrum obtained from: SDBSWeb: http://www.aist.go.jp/RIODB/SDBS/)
Definitions:
Growth Rate
The measure of a company's or an economy's increase in its revenue, earnings, or asset size over a given period, often expressed as a percentage.
Stock Market
A public market for the trading of company stocks and derivatives at agreed prices, often considered a critical indicator of the economic health of a country.
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